#include "LKH.h"
#include "Segment.h"

GainType Penalty_MLP() {
  static Node* StartRoute = 0;
  Node *N, *NextN, *CurrentRoute;
  GainType P = 0, DistanceSum;
  int Forward = SUCC(Depot)->Id != Depot->Id + DimensionSaved;

  if (!StartRoute) StartRoute = Depot;
  if (StartRoute->Id > DimensionSaved) StartRoute -= DimensionSaved;
  N = StartRoute;
  do {
    CurrentRoute = N;
    DistanceSum = 0;
    do {
      NextN = Forward ? SUCC(N) : PREDD(N);
      if (N->Id <= Dim || N->DepotId) {
        DistanceSum += (C(N, NextN) - N->Pi - NextN->Pi) / Precision;
        DistanceSum += NextN->ServiceTime;
        P += DistanceSum;
        if (P > CurrentPenalty || (P == CurrentPenalty && CurrentGain <= 0)) {
          StartRoute = CurrentRoute;
          return CurrentPenalty + (CurrentGain > 0);
        }
        if (DistanceSum > DistanceLimit && ((P += DistanceSum - DistanceLimit) > CurrentPenalty ||
                                               (P == CurrentPenalty && CurrentGain <= 0))) {
          StartRoute = CurrentRoute;
          return CurrentPenalty + (CurrentGain > 0);
        }
      }
      N = Forward ? SUCC(NextN) : PREDD(NextN);
    } while ((N = NextN)->DepotId == 0);
  } while (N != StartRoute);
  return P;
}
